[High Efficiency] Easy identification of fiber breakpoints, poor connections, bending, or cracking. Ideal for locating the correct fiber to splice or quickly identifying faults. The 30mW visual fault locator emits a 650nm bright red light for efficient fiber tracing, routing, and continuity checking. Breaks or faults in the fiber will refract the light, creating a visible glow around the affected area. [Functions] This fiber optic tester is ideal for field use with features including constant output power, multi-interface compatibility, low battery warning, extended battery life, and long-distance detection capability. Features a super bright output and operates using standard AA batteries for convenience. [Widely Used] 2.5mm universal connector designed to be compatible with ST, SC, FC, and LC interfaces, supporting both round and square-shaped fiber optic cables. [Long Output Distance] The 30mW visual fault locator delivers strong output power, emitting a highly visible red light effective up to 20-30 kilometers. High-efficiency power circuit ensures stable performance. [Crash-proof and Dust-proof Design for Pen Head] Constructed with a stainless steel tip and aluminum body for durability against impacts and dust. Grounded case design helps protect against electrostatic discharge (ESD) damage. Batteries: Two 1.5V AA batteries (not included) Type: A Color: Green + Black Material: Aluminum Alloy Package Contents: 1 x Fiber Optic Visual Fault Locator Note: Lighting and display settings may cause slight variations between the color shown in the image and the actual product. Measurement error allowance is +/- 1-3 cm.